[GRASS-dev] Ignored enhancements

[Newcomb, Doug]

Seth,
I finally got a chance to patch your enhancements from the GRASS 70 svn
code I pulled last night.

I compiled with these options:
./configure --with-gdal  --with-freetype
--with-freetype-includes=/usr/include/freetype2 --with-proj   --with-sqlite
--enable-largefile --with-cxx --enable-64bit  --with-python  --with-blas
--with-lapack  --with-cairo  --with-wxwidgets --with-spatialite
--with-tcltk --with-tcltk-includes=/usr/include/tcl8.4
--with-liblas=/usr/local/bin/liblas-config --enable-largefile --with-openmp
--with-readline

The computer uses an AMD Vishera 8 core cpu with 8GB DDR3 1333 RAM  (
freshly updated home machine)


I used this 23 million cell raster of 20ft bare earth elevation in the
mountains of western North Carolina.


 Layer:    nc_1 at PERMANENT                 Date: Thu Jul  5 20:56:51 2012
 |
 | Mapset:   PERMANENT                      Login of Creator: dnewcomb
   |
 | Location: ncstpft
   |
 | DataBase: /data1/grass7
   |
 | Title:    bilinear interpolation with Tykhonov regularization ( nc_1 )
  |
 | Timestamp: none
   |
 |----------------------------------------------------------------------------|
 |
   |
 |   Type of Map:  raster               Number of Categories: 7000
   |
 |   Data Type:    DCELL
   |
 |   Rows:         5328
  |
 |   Columns:      4375
  |
 |   Total Cells:  23310000
  |
 |        Projection: Lambert Conformal Conic
  |
 |            N:     593000    S:     486439   Res: 20.00018769
  |
 |            E:     492500    W:     405000   Res:    20
  |
 |   Range of data:    min = -8269.7102472716  max = 6999.76272107517
  |
 |
   |
 |   Data Description:
   |
 |    generated by v.surf.bspline
  |
 |
   |
 |   Comments:
   |
 |    v.surf.bspline -z input="nc_1 at PERMANENT" raster="nc_1" sie=40 sin=40\
  |
 |     method="bilinear" lambda_i=0.01 layer="1" solver="cholesky" maxit=1\
  |
 |    00 error=0.000001 memory=300
   |
 |
   |
 +----------------------------------------------------------------------------+


First, with the default GRASS 7 svn pull from 2/9

GRASS 7.0.svn (ncstpft):~ > time r.horizon -d elevin=nc_1 horizonstep=90
horizon=test_normal
Calculating map 1 of 4 (angle 0.00, raster map <test_normal_0>)
 100%
Calculating map 2 of 4 (angle 90.00, raster map <test_normal_1>)
 100%
Calculating map 3 of 4 (angle 180.00, raster map <test_normal_2>)
 100%
Calculating map 4 of 4 (angle 270.00, raster map <test_normal_3>)
 100%

real 16m14.028s
user 16m11.993s
sys 0m1.860s


Second, patching r.horizon main.c with the diff file from your patch.

GRASS 7.0.svn (ncstpft):~ > time r.horizon -d elevin=nc_1 horizonstep=90
horizon=test_price
Calculating map 1 of 4 (angle 0.00, raster map <test_price_0>)
 100%
Calculating map 2 of 4 (angle 90.00, raster map <test_price_1>)
 100%
Calculating map 3 of 4 (angle 180.00, raster map <test_price_2>)
 100%
Calculating map 4 of 4 (angle 270.00, raster map <test_price_3>)
 100%

real 14m22.607s
user 14m20.582s
sys 0m1.836s

Using r.mapcal to subtract the normal r.horizon calculation from the
modified calculation shows 0 difference between the two results

I usually run r.horizon on a 755 million cell grid and do 24 horizons, I am
assuming the the benefits would scale proportionally?


Doug



On Mon, Feb 4, 2013 at 12:40 PM, Seth Price <seth at pricepages.org> wrote:

> A while ago I made some simple, but significant, enhancements and
> submitted them to trac. They haven't been picked up, so I wanted to point
> them out so someone can commit them before they diverge from the trunk.
>
> http://trac.osgeo.org/grass/ticket/1624
>
> This has had some activity recently, but it's status is still "new" and it
> isn't in trunk.
>
> http://trac.osgeo.org/grass/ticket/1575
>
> ~Seth
>
>
> via iPhone
>
> _______________________________________________
> grass-dev mailing list
> grass-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-dev
>



-- 
Doug Newcomb
USFWS
Raleigh, NC
919-856-4520 ext. 14 doug_newcomb at fws.gov
---------------------------------------------------------------------------------------------------------
The opinions I express are my own and are not representative of the
official policy of the U.S.Fish and Wildlife Service or Dept. of the
Interior.   Life is too short for undocumented, proprietary data formats.
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